Trichocintractia utriculicola (Henn.) M. Piepenbr.


Cintractia axicola forma spicularum Juel
Cintractia leucoderma forma utriculicola Henn.
Cintractia spicularum
(Juel) Racib.
Cintractia utriculicola (Henn.) G.P. Clinton
Ustilago conglobata Cooke


Sori in some spikelets of an inflorescence, replacing flowers, ovoid, 3–5 mm long, 2.0–2.5 mm wide, covered by a thick greyish white peridium of fungal origin, initially closed, later rupturing apically exposing the black powdery mass of spores.

Spores slightly compressed, in surface view rounded to broadly elliptic, (11–) 12–16 (–17.5) × 11–15 µm; in side view broadly elliptic to slightly irregular, 10–13 µm wide, medium olivaceous brown; wall 1–2 (–2.5) µm thick, with a 4.0–6.5 µm diam. and c. 0.5 µm thick rounded area on the flattened sides where the spore colour is also paler; in LM surface apparently smooth to minutely and densely punctate; in SEM finely and densely verruculose.

Sterile cells originating from the host tissue at the base of the sorus, radiating into the spore mass, numerous, in groups but not cohering, long-cylindrical, without septa, to 600 µm long and 5 µm wide; wall to 2 µm thick, thinner at the cell apex, smooth.

Spore germination resulting in phragmobasidia producing basidiospores or hyphae.

Host family: Cyperaceae
Host species: Rhynchospora corymbosa (L.) Britton


States & Territories: QLD